import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String[] v1 = in.next().split("\\.");
        String[] v2 = in.next().split("\\.");

        int[] k = new int[3];
        int[] t = new int[3];
        for(int i = 0; i < 3; i++) {
            k[i] = Integer.parseInt(v1[i]);
            t[i] = Integer.parseInt(v2[i]);
        }

        String ans = "NO";

        if(k[0] > t[0]) {
            ans = "YES";
        } else if(k[0] == t[0]) {
            if(k[1] > t[1]) {
                ans = "YES";
            } else if(k[1] == t[1]) {
                if(k[2] >= t[2]) {
                    ans = "YES";
                }
            }
        }

        System.out.println(ans);
    }
}